IS 3084: Pencil slats-

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IS 3084 (1989)
Stores]

Jawaharlal Nehru
'Step Out From the Old to the New"

Pencil slats- [CED 9: Timber and Timber

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Satyanarayan Gangarara Pitroda
Invent a New India Using Knowledge

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PROTECTED BY COPYRIGHT

IS 3084 : 1989

( Reaffirmed 2003 )

Indian Standard

PENCIL SLATS — SPECIFICATION

( Second Revision )

UDC 674'032-3/'4— 415 : 686-863-3

© BIS 1989

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

October 1989 Price Gronp 1

Timber Stores Sectional Committeej BDC 33

FOREWORD

This Indian Standard ( Second Revision ) was adopted by the Bureau of Indian Standards on 4
January 1989, after the draft finalized by the Timber Stores Sectional Committee had been approved
by the Civil Engineering Division Council.

This standard was originally published in 1965 and the first revision was brought out in 1973, In
this second revision, Amendment No. 1 issued to the standard has been incorporated.

IS 1375 : 1959 covers black lead pencils. However, the species of timber for the manufacture of
their casing have not been specified.

To a very limited extent, the requirements of timber for pencil slats are still being met by import
of African and American cedar. However, tlie bulk of production is now based on indigenous
species of timber. The indigenous species included in this standard are based on investigations on
their suitability for making pencils tarried out by the Forest Research Institute, Dehra Dun.

This standard contains a revised list of species suitable for pencil slats in accordance with the latest
results of investigations done and a quality classification of the species has been included.

This standard contains a revised Annex B recommending a two-step and an alternative single-step
waxing and dyeing treatment procedure. Also it includes Annex A for recommended sawing
practice for slats. The dimensional tolerances to be allowed for slats prepared from green or
insufficiently seasoned timber are also included in Note 2 below 5.

In the formulation of this standard, due weightage has been given to international co-ordination
among the standards and practices prevailing in different countries in addition to relating it to the
practices in the field in this country.

For the purpose of deciding whether a particular requirement of this standard is complied with, the
final value, observed or calculated, expressing the result of a test of analysis, shall be rounded olf
in accordance with IS 2 : 1960 'Rules for rounding off numerical values ( revised )\ The number
of significant places retained in the rounded off value should be the same as that of the specified
value in this standard.

IS 3084 : 19Hy

Indian Standard

PENCIL SLATS — SPECIFICATION

( Second Revision )

1 SCOPE

1.1 'I'lii^ standard ( Second Revision ) covers the
icciulretneius of pencil slats.

2 REFERENCES

2-1 ^I lie following Indian Standards aie necessary

adjuncts to tJns standard:

IS Xo,

TiiU

IS 1375 : 1959 Specification for black pencils
IS 707 : 1976 Glossary of ternns applicable to
timber technology and utilization

{ second tevhion )

3 TERMINOLOGY

3.1 For the purpose of this standard, the deiini-
tions given in IS 707 : 1976 shall apply.

4 SPECIES OF TIMBER

4.1 Pencil slats shall be manufactured from any
of the species of timber given in Table 1.

4.2 Other species of timber may also be used
subject to prior agreement between the purchaser
and the supplier.

Table 1 Species of Timber for Pencil
Manufacture

( Clauses 4.1 and 7 )

Quality Trade

Botanical

Abbreviation

Name

Name

i Aider

Alnus spp.

ALD

Cypress

Cuprtssiis toridosa

CYP

Deodar

Cedrus deodara

DEO

Horse

A^sculus indica

IICII

chebtniit

Juniper

Junipems hiacropoda

JUN

1 1 IJakola

Endospermus jpp.

IJAK

Banati

Lophopetaluui icightianuin

liAN

Cliatian

Alstonia scholaris

c:irr

Holygent

Iloligarna arnoliana

HOY

Kadam

Anihocephalus cadamba

KAD

Kutlian

Hymenodiot_yo!i exceUuni

KUT

Lamba-

Sideroxylon longepetiolaium

LAM

patti

Rudrak

Elacocarpus iuhercidalus

RUD

4.3 The timber for pencil slats shall be Nolt, light
and reasonably strong with strait^ht nnd dose
grain. It shall have good machining propciiir.s,
shall not chip off during manufactuiing opcr^v-
tions and shall whittle well in mending. In
addition, it shall take a smootli finish and good
polish.

5 DIMENSIONS

5.1 The length, width and thickness of pen( ij
shall be as follows:

i 2 mm,

■\- 2 mm ( 8 ply ),
; 2 mm ( 7 ply ),
-r 2 mm ( 6 ply ;,
t- 2 mm ( 5 ply ),
5-5 4: 0-5 mm.

a) Length: 184

b) Width: 70

63-5
55

47

c) Thickness

NOTES

1 The term 'ply' denot^J.s the number of [x-ncils tliHt f ju
bo produced from a double sbu block.

2 For conver.Mon of pencil siats, the log should firi,t be
sawn into pencil slat blocks of adequate thickness,
allowing margin for subsequent shrinkage and depending
upon the 'ply* of slats desired ( see Annex A ). I'or bnst
results, the blocks shoukl first be air seasoned to the
required moisture content before fmal sawing of slats.
Oversizes in the width of slats, inclusiv^e of shrinkage
during drying and the sawing tolerances mentioned in 5.1
shall, however, be provided as follows if slats nro .sawn
from green or insufficiently seasoned blocks:

Width: 70 ;■ 5 mm ( 8 ply ),
G3*5 ; 5 mm ( 7 ply ),
55 ; 5 mm ( G ply }, and

47 ' 4 mm ( 5 ply ).

Extra tolerances over those prescribed in 5.1 are nui
required in the length and thickness of slats.

6 REQUIREMENTS

6.1 The moisture content of the slats shall not
exceed 12 percent.

NOTE — This is achie\'ed by seas(jning the timlni to a
moisture content not exceeding 12 i)ercent liefore sawing
into slats.

6.2 The slats shall be free from centre heart
; pith ), any kind of decay, splits, checks, cracks,
knots, splinters, borer holes, warp and any other
defect which is likely to impair their utility.

1

IS 3084 : 1989

7 TREATMENT

7.1 Slats of all timber^) given in Table 1 shall be
either with treatment or without treatment.

NOTE — Before manufacture of pencils, however, it is
essential to improve the wilting property of wood by
waxing. If desired, the colour of wood may also be
improved by dyeing treatment ( s^e Annex B ).

8 PACKING

8JL Pencil slats shall be bundled together in
suitable numbers as agreed to between the
ymrchaser and the supplier.

9 MARKING

9.1 Each bundle of pencil slats shall be lcgil>ly
and indelibly marked with the following:

a) Quantity packed-number of slats and piy^

b) Manufacturer's name, initials or recogniz-
ed trade-mark,

c) Species of timber used,

d) Whether treatment is given or not, and

e) Year of manufacture.

ANNEX A
( Clause 5 )
SAWING PROCEDURE FOR SLATS

A-1 The green sawn pencil slat blocks should be
air seasoned to appropriate moisture content
before sawing of slats to avoid warping of sawn
slats. Sawing of slats is a precision job owing to
the vary close tolerances demanded in slat thick-
ness. Slat saws ( band or circular ) need accurate

setting and maintenance to avoid taper in width
and length of sawn slats. The sawn slats need
proper stacking with restraint during storage to
avoid warping and should finally be allowed to
dry to moisture content below 12 percent.

ANNEX B

( Clause 1 )

WAXING AND DYEING TREATMENT

B-1 PROCEDURE

B«^l*l Either a two-step or a single-step waxing
and dyeing procedure shall be used for the slats

B-1.2 Two-Step Process

B-1.2.1 In the two-step procedure, partially air
dried slats shall be first charged into a vacuum-
pressure treatiug cylinder and subjected to a
vaccum for about half-an-hour. The water solu-
tion of dye shall then be admitted without break-
ing the vacuum. A suitable hydraulic pressure
shall then be applied for adequate period,
depending upon the permeability of the species,
to ensure impregnation.

NOTE — In case of deodar, cypress and juniper, a
vacuum of 55 cm of mercury is applied for 30 minutes
followed l)y a hydraulic pressure of 085 to 0*95 N/niiu"
for 1 hour. The schedule is suitably varied for treating
timbers other than deodar, cypress and juniper.

B-1.2.2 The dyed slats shall then be dried to 12
percent moisture content in open air or in a kiln,
rhey shall then be dipped in molten paraffin
wax at 80 to lOO'C and the wax shall be allow-

ed to cool through a suitable lange ol temperature
to ensure 8 to 15 percent of wax absorj^tion on
the basis of the dry weight of slats^ depending
upon the species. The superficially waxed slats
shall be finally given a heat treatment in a kiln
at 70 to 80°C for 12 to 24 hours to allow the wax
to penetrate uniformly into the slats.

B-1.3 Single-Step Process { Alternative
Process )

The dyeing and waxing of air dried slats may
alternatively be carried out in a single step using
a suitable w^ater emulsion or dispersion of wax
to which dye shall be added provided an absoip-
tion of wax l^etween 8 to 15 percent of the dry
weight of siais is attained. The impregnation
with wax emulsion or dispersion shall be carried
out by a vacuum-pressure treating procedure
similar to that described in B-1.2.1 keeping the
treating solution heated above the melting point
of w'ax, if necessary. The treated slats shall then
be finally dried and conditioned in a kiln for
adequate period and the temperature final] v
raised to 70 to 80°C.

Standard Mark

The use of the Standard Mark is governed by the provisions of the Bureau of Indian
Standards Act^ 1986 and the Rules and Regulations made thereunder. The Standard Mark on
products covered by an Indian Standard conveys the assurance that they have been produced
to comply with the requirements of that standard under a well defined system of inspection,
testing and quality control which is devised and supervised by BIS and operated by the pro-
ducer. Standard marked products are also continuously checked by BIS for conformity to that
standard as a further safeguard. Details of conditions under which a licence for the use
of the Standard Mark may be granted to manufacturers or producers may be obtained from
the Bureau of Indian Standards.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act^ 1986 to promote
harmonious development of the activities of standardization, inarkmg and quality certification of
goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in
any form without the prior permission in writing of BIS. This does not preclude the free use, in
the course of implementing the standard, of necessary details, such as symbols and sizes, type or
grade designations. Enquiries relating to copyright be addressed to the Director ( Publications), BIS.

Revision of Indian Standards

Indian Standards are reviewed periodically and revised, when necessary and amendments, if any,
are issued from time to time. Users of Indian Standards should ascertain that ihey are in
possession of the latest amendments or edition. Comments on this Indian Standard may be sent
to BIS giving the following reference :

Doc : No. BDC 33 ( 4481 )

Amendments Issued Since Publication

Amend No.

Date of Issue

Text Affected

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